From Vionic, the Men's Sage RX Mesh Recovery Slip On Sneakers feature: Breathable mesh fabric upper Slip on with stretch knit convertible heel counter lets you wear it up or down, adapting to your recovery style Fabric lining Removable soft EVA massaging footbed that soothes with every step Powered by VioMotion Technology, the dual-density foam footbed is engineered to maintain its shape and support without collapsing under pressure Durable synthetic rubber outsole Imported.